<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <!-- 按钮控制容器中内容的变化 -->
    <button id="btn">修改vDOM,并重新渲染</button>
    <!-- 创建一个容器  -->
    <div id="app"></div>

    <script type = "text/babel">
        const arr = ["html","css","js","jq"]
        const vDOM = (
           <ul>
            {
                arr.map(item => (<li>{item}</li>))
            }
           </ul>
        )
    
    // 获取容器并进行渲染
    const root = ReactDOM.createRoot(document.getElementById("app"))
    root.render(vDOM)

    //如果是按顺序进行添加,则保留原来的元素 只更新新增的元素
    const oBtn = document.getElementById("btn")
    oBtn.onclick = function(){
        arr.push("react")
        const vDOM = (
           <ul>
            {
                arr.map(item => (<li>{item}</li>))
            }
           </ul>
        )
        root.render(vDOM)
    }

    </script>
</body>

</html>